Comment #1 on issue 4008 by abro...@verizon.net: geometric algebra doesn't
seem to work
http://code.google.com/p/sympy/issues/detail?id=4008
Improper usage. The following works -
from sympy.galgebra import *
metric = '1 0 0,0 1 0,0 0 1'
gamma_x,gamma_y,gamma_z = MV.setup('gamma_x gamma_y
Comment #2 on issue 4008 by abro...@verizon.net: geometric algebra doesn't
seem to work
http://code.google.com/p/sympy/issues/detail?id=4008
Improper use. metric is keyword. The following works -
from sympy.galgebra import *
metric = '1 0 0,0 1 0,0 0 1'
gamma_x,gamma_y,gamma_z =
Status: New
Owner:
Labels: Type-Defect Priority-Medium
New issue 4009 by randy.he...@clockworklab.net: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
simplify(And(Equality(a, 2), c))
False
This is obviously
Updates:
Status: Valid
Cc: srjoglek...@gmail.com
Labels: Simplify Logic WrongResult
Comment #1 on issue 4009 by asmeu...@gmail.com: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
(No comment was
Comment #2 on issue 4009 by asmeu...@gmail.com: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
You really should use Equivalent, which is the logical double implies
In [39]: simplify_logic(And(Equivalent(a, b), c))
Comment #3 on issue 4009 by randy.he...@clockworklab.net: Incorrect
behaviour in simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
I am interested in actual equality, not equivalence. I am trying to check
if a set of equations all hold, and am
Status: Valid
Owner:
Labels: Type-Defect Priority-Medium Integration
New issue 4010 by ondrej.c...@gmail.com: integrate(sqrt(a**2/(a**2-x**2)),
x) can't do it
http://code.google.com/p/sympy/issues/detail?id=4010
var(x a)
(x, a)
integrate(sqrt(a**2/(a**2-x**2)), x)
⌠
⎮
Comment #1 on issue 4010 by ondrej.c...@gmail.com:
integrate(sqrt(a**2/(a**2-x**2)), x) can't do it
http://code.google.com/p/sympy/issues/detail?id=4010
The solution is atan() with some constants:
http://www.wolframalpha.com/input/?i=integrate%28sqrt%28a**2%2F%28a**2-x**2%29%29%2C+x%29
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Comment #3 on issue 4008 by asmeu...@gmail.com: geometric algebra doesn't
seem to work
http://code.google.com/p/sympy/issues/detail?id=4008
See this question from stackoverflow
http://stackoverflow.com/q/18667274/161801
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Comment #4 on issue 4009 by asmeu...@gmail.com: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
Oh, so Eq and Equivalent *are* different then. Eq should be treated as a
predicate and left unchanged.
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Status: New
Owner:
Labels: Type-Defect Priority-Medium
New issue 4011 by ben.luc...@gmail.com: Solutions for cubics
http://code.google.com/p/sympy/issues/detail?id=4011
Say I have
y = -2*x**3 + 4*x**2 - 2*x + 5
solutions = solve(y)
print( [ask(Q.real(i)) for i in solutions] )
gives
Updates:
Status: Valid
Labels: Assumptions Solvers Simplify WrongResult
Comment #1 on issue 4011 by asmeu...@gmail.com: Solutions for cubics
http://code.google.com/p/sympy/issues/detail?id=4011
Regardless of the form of the solutions, ask should not return wrong
results.
As
@Aaron, thank you very much for the explanation. I would have taken much
longer to achieve this alone... we should post this as a question in
StackOverflow since I haven't found it there so far...
2013/9/7 Aaron Meurer asmeu...@gmail.com
The workflow is that you clone a repo once, from the
Hello,
is there a little history of the birth and the evolution of Sympy ? I'm
interesting by the human adventure.
Christophe
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Hi,
See if these links can help.
http://docs.sympy.org/0.7.3/aboutus.html
http://ondrejcertik.blogspot.com/
Regards,
Thilina
On Sun, Sep 8, 2013 at 1:50 PM, Christophe Bal projet...@gmail.com wrote:
Hello,
is there a little history of the birth and the evolution of Sympy ? I'm
Thanks for this !
Christophe
Le 8 sept. 2013 13:55, Thilina Rathnayake thilina.r...@gmail.com a
écrit :
Hi,
See if these links can help.
http://docs.sympy.org/0.7.3/aboutus.html
http://ondrejcertik.blogspot.com/
Regards,
Thilina
On Sun, Sep 8, 2013 at 1:50 PM, Christophe Bal
On Sat, Sep 7, 2013 at 7:06 PM, Cristóvão Sousa cris...@gmail.com wrote:
On Sunday, September 8, 2013 1:55:12 AM UTC+1, Cristóvão Sousa wrote:
Hi all,
I just want to announce that a new implementation of Common Subexpression
Elimination (CSE) routine has been merged into master (PR:
On Sun, Sep 8, 2013 at 5:55 AM, Thilina Rathnayake
thilina.r...@gmail.com wrote:
Hi,
See if these links can help.
http://docs.sympy.org/0.7.3/aboutus.html
http://ondrejcertik.blogspot.com/
There is also something here:
https://github.com/certik/sympy/blob/master/README.rst#brief-history
On Sun, Sep 8, 2013 at 11:18 AM, Ondřej Čertík ondrej.cer...@gmail.com wrote:
On Sun, Sep 8, 2013 at 5:55 AM, Thilina Rathnayake
thilina.r...@gmail.com wrote:
Hi,
See if these links can help.
http://docs.sympy.org/0.7.3/aboutus.html
http://ondrejcertik.blogspot.com/
There is also
Thanks.
Christophe
Le 8 sept. 2013 19:18, Ondřej Čertík ondrej.cer...@gmail.com a écrit :
On Sun, Sep 8, 2013 at 11:18 AM, Ondřej Čertík ondrej.cer...@gmail.com
wrote:
On Sun, Sep 8, 2013 at 5:55 AM, Thilina Rathnayake
thilina.r...@gmail.com wrote:
Hi,
See if these links can help.
You can also check out the primary sources, namely, the mailing list
archives, the archives of the patches list (it used to be used quite a
bit before GitHub), old issues, and commits from
http://github.com/sympy/sympy-old.
The mailing list and patches list archives are probably the most
Or just buy Ondrej a beer and he'll tell you everything you want to know.
Aaron Meurer
On Sun, Sep 8, 2013 at 2:04 PM, Aaron Meurer asmeu...@gmail.com wrote:
You can also check out the primary sources, namely, the mailing list
archives, the archives of the patches list (it used to be used
It would be a great pleasure but I'm a french frog... :-)
2013/9/8 Aaron Meurer asmeu...@gmail.com
Or just buy Ondrej a beer and he'll tell you everything you want to know.
Aaron Meurer
On Sun, Sep 8, 2013 at 2:04 PM, Aaron Meurer asmeu...@gmail.com wrote:
You can also check out the
I drink wine too. :)
On Sun, Sep 8, 2013 at 2:27 PM, Christophe Bal projet...@gmail.com wrote:
It would be a great pleasure but I'm a french frog... :-)
2013/9/8 Aaron Meurer asmeu...@gmail.com
Or just buy Ondrej a beer and he'll tell you everything you want to know.
Aaron Meurer
On
The workflow I described is not the only way to do things, it's just
the way that we do things in this community (and most similar
communities on GitHub). But some projects use completely different
workflows (e.g., some projects push all their branches to the main
repo and don't use forks at all).
Hi,
Currently SymPy can't do this integral:
integrate(sqrt(a**2/(a**2-x**2)), x)
and I reported it here:
https://code.google.com/p/sympy/issues/detail?id=4010
It seems SymPy cannot even do this integral:
integrate(sqrt(1/(1-x**2)), x)
the solution of which is asin(x), at least for real x.
The problem is that sqrt(1/x) is not the same as 1/sqrt(x). If you are
working in a situation where it is, you can do integrate(1/sqrt(1 -
x**2), x) and this works.
These algebraic integrals are tricky. They only work with the current
heurisch algorithm by accident, because they happen to come
Another idea would be to implement a basic table lookup for such
integrals (https://code.google.com/p/sympy/issues/detail?id=1393).
This would be the least powerful, as it would only work for
expressions exactly of the form we put in the table, but it would be
fast, and wouldn't require figuring
On Sun, Sep 8, 2013 at 5:48 PM, Aaron Meurer asmeu...@gmail.com wrote:
Another idea would be to implement a basic table lookup for such
integrals (https://code.google.com/p/sympy/issues/detail?id=1393).
This would be the least powerful, as it would only work for
expressions exactly of the form
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